Enjoy uchinuki spring water and a variety of hot springs in a Bali-inspired tropical resort setting
Ehime Saijo City
Toyo Onsen Iyashi no Resort is a day-use bathing facility in Saijo City, Ehime Prefecture, themed on tropical Bali. The exotic space, decorated with palm trees and ceramic ornaments, lets you forget everyday life and relax. The sauna is a dry sauna using far-infrared heaters, and the facility's pride is a pleasant cold plunge bath filled with Saijo City's famous uchinuki spring water. The spacious outdoor area features a natural hot spring bath, barrel baths, a walking bath, and reclining baths, and the open-air resting area offers a liberating outdoor bathing experience.
TypeNatural Hot Spring
A sodium chloride hot spring (hypotonic, weakly alkaline, low-temperature). The outdoor area includes a natural hot spring bath that is slightly lukewarm and ideal for long soaks. Other options include barrel baths, a walking bath, a reclining bath where hot spring water flows along the floor, and medicinal baths, offering a wide variety of bathing experiences. A women-only bedrock spa (ganbanyoku) is also available.
Sauna TypeDry Sauna
Stove Typefar_infrared
A U-shaped two-tier tower dry sauna using far-infrared heaters. The room temperature is around 88°C–90°C, set to be not too intense so you can perspire gradually. The bright, spacious interior accommodates about 25 people, allowing you to enjoy a relaxed sauna session while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
The cold plunge bath is located just outside the sauna room. Water temperature is about 17°C–19°C. It uses Saijo City's famous uchinuki spring water, which has a soft feel on the skin and is comfortable for longer soaks. Water depth is 40–60 cm and it holds about 5 people. The balance with the sauna is good, and because it lacks a sharp coldness it is recommended for beginners.
Closed Days: None
687-1 Shufu, Saijo City, Ehime Prefecture 799-1371, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
Enjoy uchinuki spring water and a variety of hot springs in a Bali-inspired tropical resort setting
Ehime Saijo City
Toyo Onsen Iyashi no Resort is a day-use bathing facility in Saijo City, Ehime Prefecture, themed on tropical Bali. The exotic space, decorated with palm trees and ceramic ornaments, lets you forget everyday life and relax. The sauna is a dry sauna using far-infrared heaters, and the facility's pride is a pleasant cold plunge bath filled with Saijo City's famous uchinuki spring water. The spacious outdoor area features a natural hot spring bath, barrel baths, a walking bath, and reclining baths, and the open-air resting area offers a liberating outdoor bathing experience.
TypeNatural Hot Spring
A sodium chloride hot spring (hypotonic, weakly alkaline, low-temperature). The outdoor area includes a natural hot spring bath that is slightly lukewarm and ideal for long soaks. Other options include barrel baths, a walking bath, a reclining bath where hot spring water flows along the floor, and medicinal baths, offering a wide variety of bathing experiences. A women-only bedrock spa (ganbanyoku) is also available.
Sauna TypeDry Sauna
Stove Typefar_infrared
A U-shaped two-tier tower dry sauna using far-infrared heaters. The room temperature is around 88°C–90°C, set to be not too intense so you can perspire gradually. The bright, spacious interior accommodates about 25 people, allowing you to enjoy a relaxed sauna session while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
The cold plunge bath is located just outside the sauna room. Water temperature is about 17°C–19°C. It uses Saijo City's famous uchinuki spring water, which has a soft feel on the skin and is comfortable for longer soaks. Water depth is 40–60 cm and it holds about 5 people. The balance with the sauna is good, and because it lacks a sharp coldness it is recommended for beginners.
Closed Days: None
687-1 Shufu, Saijo City, Ehime Prefecture 799-1371, Japan
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more